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Old 08-26-2008, 07:10 AM
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Max. idle speed setting on Edelbrock carb?

I'm preparing my SBC for first start-up after quite a bit of work (heads/cam/valvetrain upgrades) and I want the engine to start and immediately rev to 2k-3k. I know I could have an assistant set the idle speed screw once I've got my foot holding the engine at the desired RPM, but I was wondering what the engine would 'idle' at with the idle speed screw screwed all the way in (with the spring still in place). This is what I've provisionally set my carb up with. I'm thinking it will be around 2k? I could also take the spring out so I could set it higher. What do you guys think?

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Old 08-26-2008, 09:31 AM
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Quote:
Originally Posted by v8hed
I'm preparing my SBC for first start-up after quite a bit of work (heads/cam/valvetrain upgrades) and I want the engine to start and immediately rev to 2k-3k. I know I could have an assistant set the idle speed screw once I've got my foot holding the engine at the desired RPM, but I was wondering what the engine would 'idle' at with the idle speed screw screwed all the way in (with the spring still in place). This is what I've provisionally set my carb up with. I'm thinking it will be around 2k? I could also take the spring out so I could set it higher. What do you guys think?
The idle would probably be way too high doing that.

I'd suggest if you are doing the initial break-in by yourself, that you mount your tach in a position that you can see it from the engine area. Start the engine using a remote start and then adjust the idle stop screw to the RPM you wish while viewing the tach. Varying the engine RPM a few hundred RPM during the break-in is helpful.

While the break-in is being performed, go around the engine checking for any leaks (i.e. water, fuel, oil). Shut engine off and fix any you might have. Re-start and continue the break-in. Watch the oil pressure and the water temperature. Do NOT be concerned with adjusting the carb until after the break-in.
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Old 08-26-2008, 09:39 AM
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yes the idle screw will adjust to 3,000+ (great for plotting the cent curve)

BUT

the gamble is if you do need to drop the rpms immediately .....

it's likely 4-6 full turns on the screw head at 2500 to get back to idle!!!!

if you do have to do it alone:
use a loose zip tie from the linkage to a bracket....
once the motor is started tighten the zip tie to set the rpms....
set your wire snipes on the fender incase ya gotta drop the rpms!!!
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Old 08-26-2008, 09:43 AM
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My suggestion would be to manually set the choke on the highest step of the choke cam. This will get you close to 1200-1500rpm. Then start it up with a remote starter button and do as mentioned above.

Mark
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Old 08-26-2008, 10:13 AM
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Jmark, v8hed,
just so ya know,
12-1500 fast idle on a Edie is usually just barely on the fast idle cam....
you can rotate the cam for 2500+ at start (after adjusting the choke cap for no action) but at that linkage point, the carb is working off the primaries trying to start....it may flood the motor due to low cranking Hg

v8hed,
remote starter is a smart move!!!
to make one, just buy a momentary (doorbell type) switch, a inline fuse holder,some #12 wire and a couple of alligator clips....
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